A 400 Kg Object Is Moving at 5

Multiple Choice

A 4.00 kg object is moving at 5.00 m/s EAST. It strikes a 6.00 kg object that is at rest. The objects undergo an elastic collision. The velocity of the 4.00 kg object after the collision is at an angle of 30.0 degrees SOUTH of EAST. The speed of the 4.00 kg mass after the collision is

A) 5.78 m/s.
B) 4.56 m/s.
C) 3.55 m/s.
D) 1.67 m/s.
E) 2.66 m/s.